Its a setting in your car, you can change how the doors lock or dont lock, how they unlock etc, all through your cars dash menu.
New car models have facility of Walk Away Auto Lock. All you have to do shut the vehicle off. Make sure you have the key with you. Exit the vehicle and once you get 2.5 meters away from the vehicle will get locked.
Maybe a little more info on ur car would help
Dependent on the year, most newer modeled vehicles, have that feature as an anti-theft detterent. Deal with it, at least your car wont get stolen!
Not sure! Maybe service or internet community has some information!
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